OperationSupport.h

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//===- OperationSupport.h ---------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines a number of support types that Operation and related
// classes build on top of.
//
//===----------------------------------------------------------------------===//
 
#ifndef MLIR_IR_OPERATIONSUPPORT_H
#define MLIR_IR_OPERATIONSUPPORT_H
 
#include "mlir/IR/Attributes.h"
#include "mlir/IR/BlockSupport.h"
#include "mlir/IR/BuiltinAttributes.h"
#include "mlir/IR/Diagnostics.h"
#include "mlir/IR/DialectRegistry.h"
#include "mlir/IR/Location.h"
#include "mlir/IR/TypeRange.h"
#include "mlir/IR/Types.h"
#include "mlir/IR/Value.h"
#include "mlir/Support/InterfaceSupport.h"
#include "llvm/ADT/BitmaskEnum.h"
#include "llvm/ADT/PointerUnion.h"
#include "llvm/ADT/STLFunctionalExtras.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/PointerLikeTypeTraits.h"
#include "llvm/Support/TrailingObjects.h"
#include <memory>
#include <optional>
 
namespace llvm {
class BitVector;
} // namespace llvm
 
namespace mlir {
class Dialect;
class DictionaryAttr;
class ElementsAttr;
struct EmptyProperties;
class MutableOperandRangeRange;
class NamedAttrList;
class Operation;
struct OperationState;
class OpAsmParser;
class OpAsmPrinter;
class OperandRange;
class OperandRangeRange;
class OpFoldResult;
class Pattern;
class Region;
class ResultRange;
class RewritePattern;
class RewritePatternSet;
class Type;
class Value;
class ValueRange;
template <typename ValueRangeT>
class ValueTypeRange;
 
//===----------------------------------------------------------------------===//
// OpaqueProperties
//===----------------------------------------------------------------------===//
 
/// Simple wrapper around a void* in order to express generically how to pass
/// in op properties through APIs.
class OpaqueProperties {
public:
  OpaqueProperties(void *prop) : properties(prop) {}
  operator bool() const { return properties != nullptr; }
  template <typename Dest>
  Dest as() const {
    return static_cast<Dest>(const_cast<void *>(properties));
  }
 
private:
  void *properties;
};
 
//===----------------------------------------------------------------------===//
// OperationName
//===----------------------------------------------------------------------===//
 
class OperationName {
public:
  using FoldHookFn = llvm::unique_function<LogicalResult(
      Operation *, ArrayRef<Attribute>, SmallVectorImpl<OpFoldResult> &) const>;
  using HasTraitFn = llvm::unique_function<bool(TypeID) const>;
  using ParseAssemblyFn =
      llvm::unique_function<ParseResult(OpAsmParser &, OperationState &)>;
  // Note: RegisteredOperationName is passed as reference here as the derived
  // class is defined below.
  using PopulateDefaultAttrsFn =
      llvm::unique_function<void(const OperationName &, NamedAttrList &) const>;
  using PrintAssemblyFn =
      llvm::unique_function<void(Operation *, OpAsmPrinter &, StringRef) const>;
  using VerifyInvariantsFn =
      llvm::unique_function<LogicalResult(Operation *) const>;
  using VerifyRegionInvariantsFn =
      llvm::unique_function<LogicalResult(Operation *) const>;
 
  /// This class represents a type erased version of an operation. It contains
  /// all of the components necessary for opaquely interacting with an
  /// operation. If the operation is not registered, some of these components
  /// may not be populated.
  struct InterfaceConcept {
    virtual ~InterfaceConcept() = default;
    virtual LogicalResult foldHook(Operation *, ArrayRef<Attribute>,
                                   SmallVectorImpl<OpFoldResult> &) = 0;
    virtual void getCanonicalizationPatterns(RewritePatternSet &,
                                             MLIRContext *) = 0;
    virtual bool hasTrait(TypeID) = 0;
    virtual OperationName::ParseAssemblyFn getParseAssemblyFn() = 0;
    virtual void populateDefaultAttrs(const OperationName &,
                                      NamedAttrList &) = 0;
    virtual void printAssembly(Operation *, OpAsmPrinter &, StringRef) = 0;
    virtual LogicalResult verifyInvariants(Operation *) = 0;
    virtual LogicalResult verifyRegionInvariants(Operation *) = 0;
    /// Implementation for properties
    virtual std::optional<Attribute> getInherentAttr(Operation *,
                                                     StringRef name) = 0;
    virtual void setInherentAttr(Operation *op, StringAttr name,
                                 Attribute value) = 0;
    virtual void populateInherentAttrs(Operation *op, NamedAttrList &attrs) = 0;
    virtual LogicalResult
    verifyInherentAttrs(OperationName opName, NamedAttrList &attributes,
                        function_ref<InFlightDiagnostic()> emitError) = 0;
    virtual int getOpPropertyByteSize() = 0;
    virtual void initProperties(OperationName opName, OpaqueProperties storage,
                                OpaqueProperties init) = 0;
    virtual void deleteProperties(OpaqueProperties) = 0;
    virtual void populateDefaultProperties(OperationName opName,
                                           OpaqueProperties properties) = 0;
    virtual LogicalResult
    setPropertiesFromAttr(OperationName, OpaqueProperties, Attribute,
                          function_ref<InFlightDiagnostic()> emitError) = 0;
    virtual Attribute getPropertiesAsAttr(Operation *) = 0;
    virtual void copyProperties(OpaqueProperties, OpaqueProperties) = 0;
    virtual bool compareProperties(OpaqueProperties, OpaqueProperties) = 0;
    virtual llvm::hash_code hashProperties(OpaqueProperties) = 0;
  };
 
public:
  class Impl : public InterfaceConcept {
  public:
    Impl(StringRef, Dialect *dialect, TypeID typeID,
         detail::InterfaceMap interfaceMap);
    Impl(StringAttr name, Dialect *dialect, TypeID typeID,
         detail::InterfaceMap interfaceMap)
        : name(name), typeID(typeID), dialect(dialect),
          interfaceMap(std::move(interfaceMap)) {}
 
    /// Returns true if this is a registered operation.
    bool isRegistered() const { return typeID != TypeID::get<void>(); }
    detail::InterfaceMap &getInterfaceMap() { return interfaceMap; }
    Dialect *getDialect() const { return dialect; }
    StringAttr getName() const { return name; }
    TypeID getTypeID() const { return typeID; }
    ArrayRef<StringAttr> getAttributeNames() const { return attributeNames; }
 
  protected:
    //===------------------------------------------------------------------===//
    // Registered Operation Info
 
    /// The name of the operation.
    StringAttr name;
 
    /// The unique identifier of the derived Op class.
    TypeID typeID;
 
    /// The following fields are only populated when the operation is
    /// registered.
 
    /// This is the dialect that this operation belongs to.
    Dialect *dialect;
 
    /// A map of interfaces that were registered to this operation.
    detail::InterfaceMap interfaceMap;
 
    /// A list of attribute names registered to this operation in StringAttr
    /// form. This allows for operation classes to use StringAttr for attribute
    /// lookup/creation/etc., as opposed to raw strings.
    ArrayRef<StringAttr> attributeNames;
 
    friend class RegisteredOperationName;
  };
 
protected:
  /// Default implementation for unregistered operations.
  struct UnregisteredOpModel : public Impl {
    using Impl::Impl;
    LogicalResult foldHook(Operation *, ArrayRef<Attribute>,
                           SmallVectorImpl<OpFoldResult> &) final;
    void getCanonicalizationPatterns(RewritePatternSet &, MLIRContext *) final;
    bool hasTrait(TypeID) final;
    OperationName::ParseAssemblyFn getParseAssemblyFn() final;
    void populateDefaultAttrs(const OperationName &, NamedAttrList &) final;
    void printAssembly(Operation *, OpAsmPrinter &, StringRef) final;
    LogicalResult verifyInvariants(Operation *) final;
    LogicalResult verifyRegionInvariants(Operation *) final;
    /// Implementation for properties
    std::optional<Attribute> getInherentAttr(Operation *op,
                                             StringRef name) final;
    void setInherentAttr(Operation *op, StringAttr name, Attribute value) final;
    void populateInherentAttrs(Operation *op, NamedAttrList &attrs) final;
    LogicalResult
    verifyInherentAttrs(OperationName opName, NamedAttrList &attributes,
                        function_ref<InFlightDiagnostic()> emitError) final;
    int getOpPropertyByteSize() final;
    void initProperties(OperationName opName, OpaqueProperties storage,
                        OpaqueProperties init) final;
    void deleteProperties(OpaqueProperties) final;
    void populateDefaultProperties(OperationName opName,
                                   OpaqueProperties properties) final;
    LogicalResult
    setPropertiesFromAttr(OperationName, OpaqueProperties, Attribute,
                          function_ref<InFlightDiagnostic()> emitError) final;
    Attribute getPropertiesAsAttr(Operation *) final;
    void copyProperties(OpaqueProperties, OpaqueProperties) final;
    bool compareProperties(OpaqueProperties, OpaqueProperties) final;
    llvm::hash_code hashProperties(OpaqueProperties) final;
  };
 
public:
  OperationName(StringRef name, MLIRContext *context);
 
  /// Return if this operation is registered.
  bool isRegistered() const { return getImpl()->isRegistered(); }
 
  /// Return the unique identifier of the derived Op class, or null if not
  /// registered.
  TypeID getTypeID() const { return getImpl()->getTypeID(); }
 
  /// If this operation is registered, returns the registered information,
  /// std::nullopt otherwise.
  std::optional<RegisteredOperationName> getRegisteredInfo() const;
 
  /// This hook implements a generalized folder for this operation. Operations
  /// can implement this to provide simplifications rules that are applied by
  /// the Builder::createOrFold API and the canonicalization pass.
  ///
  /// This is an intentionally limited interface - implementations of this
  /// hook can only perform the following changes to the operation:
  ///
  ///  1. They can leave the operation alone and without changing the IR, and
  ///     return failure.
  ///  2. They can mutate the operation in place, without changing anything
  ///  else
  ///     in the IR.  In this case, return success.
  ///  3. They can return a list of existing values that can be used instead
  ///  of
  ///     the operation.  In this case, fill in the results list and return
  ///     success.  The caller will remove the operation and use those results
  ///     instead.
  ///
  /// This allows expression of some simple in-place canonicalizations (e.g.
  /// "x+0 -> x", "min(x,y,x,z) -> min(x,y,z)", "x+y-x -> y", etc), as well as
  /// generalized constant folding.
  LogicalResult foldHook(Operation *op, ArrayRef<Attribute> operands,
                         SmallVectorImpl<OpFoldResult> &results) const {
    return getImpl()->foldHook(op, operands, results);
  }
 
  /// This hook returns any canonicalization pattern rewrites that the
  /// operation supports, for use by the canonicalization pass.
  void getCanonicalizationPatterns(RewritePatternSet &results,
                                   MLIRContext *context) const {
    return getImpl()->getCanonicalizationPatterns(results, context);
  }
 
  /// Returns true if the operation was registered with a particular trait, e.g.
  /// hasTrait<OperandsAreSignlessIntegerLike>(). Returns false if the operation
  /// is unregistered.
  template <template <typename T> class Trait>
  bool hasTrait() const {
    return hasTrait(TypeID::get<Trait>());
  }
  bool hasTrait(TypeID traitID) const { return getImpl()->hasTrait(traitID); }
 
  /// Returns true if the operation *might* have the provided trait. This
  /// means that either the operation is unregistered, or it was registered with
  /// the provide trait.
  template <template <typename T> class Trait>
  bool mightHaveTrait() const {
    return mightHaveTrait(TypeID::get<Trait>());
  }
  bool mightHaveTrait(TypeID traitID) const {
    return !isRegistered() || getImpl()->hasTrait(traitID);
  }
 
  /// Return the static hook for parsing this operation assembly.
  ParseAssemblyFn getParseAssemblyFn() const {
    return getImpl()->getParseAssemblyFn();
  }
 
  /// This hook implements the method to populate defaults attributes that are
  /// unset.
  void populateDefaultAttrs(NamedAttrList &attrs) const {
    getImpl()->populateDefaultAttrs(*this, attrs);
  }
 
  /// This hook implements the AsmPrinter for this operation.
  void printAssembly(Operation *op, OpAsmPrinter &p,
                     StringRef defaultDialect) const {
    return getImpl()->printAssembly(op, p, defaultDialect);
  }
 
  /// These hooks implement the verifiers for this operation.  It should emits
  /// an error message and returns failure if a problem is detected, or
  /// returns success if everything is ok.
  LogicalResult verifyInvariants(Operation *op) const {
    return getImpl()->verifyInvariants(op);
  }
  LogicalResult verifyRegionInvariants(Operation *op) const {
    return getImpl()->verifyRegionInvariants(op);
  }
 
  /// Return the list of cached attribute names registered to this operation.
  /// The order of attributes cached here is unique to each type of operation,
  /// and the interpretation of this attribute list should generally be driven
  /// by the respective operation. In many cases, this caching removes the
  /// need to use the raw string name of a known attribute.
  ///
  /// For example the ODS generator, with an op defining the following
  /// attributes:
  ///
  ///   let arguments = (ins I32Attr:$attr1, I32Attr:$attr2);
  ///
  /// ... may produce an order here of ["attr1", "attr2"]. This allows for the
  /// ODS generator to directly access the cached name for a known attribute,
  /// greatly simplifying the cost and complexity of attribute usage produced
  /// by the generator.
  ///
  ArrayRef<StringAttr> getAttributeNames() const {
    return getImpl()->getAttributeNames();
  }
 
  /// Returns an instance of the concept object for the given interface if it
  /// was registered to this operation, null otherwise. This should not be used
  /// directly.
  template <typename T>
  typename T::Concept *getInterface() const {
    return getImpl()->getInterfaceMap().lookup<T>();
  }
 
  /// Attach the given models as implementations of the corresponding
  /// interfaces for the concrete operation.
  template <typename... Models>
  void attachInterface() {
    // Handle the case where the models resolve a promised interface.
    (dialect_extension_detail::handleAdditionOfUndefinedPromisedInterface(
         *getDialect(), getTypeID(), Models::Interface::getInterfaceID()),
     ...);
 
    getImpl()->getInterfaceMap().insertModels<Models...>();
  }
 
  /// Returns true if `InterfaceT` has been promised by the dialect or
  /// implemented.
  template <typename InterfaceT>
  bool hasPromiseOrImplementsInterface() const {
    return dialect_extension_detail::hasPromisedInterface(
               getDialect(), getTypeID(), InterfaceT::getInterfaceID()) ||
           hasInterface<InterfaceT>();
  }
 
  /// Returns true if this operation has the given interface registered to it.
  template <typename T>
  bool hasInterface() const {
    return hasInterface(TypeID::get<T>());
  }
  bool hasInterface(TypeID interfaceID) const {
    return getImpl()->getInterfaceMap().contains(interfaceID);
  }
 
  /// Returns true if the operation *might* have the provided interface. This
  /// means that either the operation is unregistered, or it was registered with
  /// the provide interface.
  template <typename T>
  bool mightHaveInterface() const {
    return mightHaveInterface(TypeID::get<T>());
  }
  bool mightHaveInterface(TypeID interfaceID) const {
    return !isRegistered() || hasInterface(interfaceID);
  }
 
  /// Lookup an inherent attribute by name, this method isn't recommended
  /// and may be removed in the future.
  std::optional<Attribute> getInherentAttr(Operation *op,
                                           StringRef name) const {
    return getImpl()->getInherentAttr(op, name);
  }
 
  void setInherentAttr(Operation *op, StringAttr name, Attribute value) const {
    return getImpl()->setInherentAttr(op, name, value);
  }
 
  void populateInherentAttrs(Operation *op, NamedAttrList &attrs) const {
    return getImpl()->populateInherentAttrs(op, attrs);
  }
  /// This method exists for backward compatibility purpose when using
  /// properties to store inherent attributes, it enables validating the
  /// attributes when parsed from the older generic syntax pre-Properties.
  LogicalResult
  verifyInherentAttrs(NamedAttrList &attributes,
                      function_ref<InFlightDiagnostic()> emitError) const {
    return getImpl()->verifyInherentAttrs(*this, attributes, emitError);
  }
  /// This hooks return the number of bytes to allocate for the op properties.
  int getOpPropertyByteSize() const {
    return getImpl()->getOpPropertyByteSize();
  }
 
  /// This hooks destroy the op properties.
  void destroyOpProperties(OpaqueProperties properties) const {
    getImpl()->deleteProperties(properties);
  }
 
  /// Initialize the op properties.
  void initOpProperties(OpaqueProperties storage, OpaqueProperties init) const {
    getImpl()->initProperties(*this, storage, init);
  }
 
  /// Set the default values on the ODS attribute in the properties.
  void populateDefaultProperties(OpaqueProperties properties) const {
    getImpl()->populateDefaultProperties(*this, properties);
  }
 
  /// Return the op properties converted to an Attribute.
  Attribute getOpPropertiesAsAttribute(Operation *op) const {
    return getImpl()->getPropertiesAsAttr(op);
  }
 
  /// Define the op properties from the provided Attribute.
  LogicalResult setOpPropertiesFromAttribute(
      OperationName opName, OpaqueProperties properties, Attribute attr,
      function_ref<InFlightDiagnostic()> emitError) const {
    return getImpl()->setPropertiesFromAttr(opName, properties, attr,
                                            emitError);
  }
 
  void copyOpProperties(OpaqueProperties lhs, OpaqueProperties rhs) const {
    return getImpl()->copyProperties(lhs, rhs);
  }
 
  bool compareOpProperties(OpaqueProperties lhs, OpaqueProperties rhs) const {
    return getImpl()->compareProperties(lhs, rhs);
  }
 
  llvm::hash_code hashOpProperties(OpaqueProperties properties) const {
    return getImpl()->hashProperties(properties);
  }
 
  /// Return the dialect this operation is registered to if the dialect is
  /// loaded in the context, or nullptr if the dialect isn't loaded.
  Dialect *getDialect() const {
    return isRegistered() ? getImpl()->getDialect()
                          : getImpl()->getName().getReferencedDialect();
  }
 
  /// Return the name of the dialect this operation is registered to.
  StringRef getDialectNamespace() const;
 
  /// Return the operation name with dialect name stripped, if it has one.
  StringRef stripDialect() const { return getStringRef().split('.').second; }
 
  /// Return the context this operation is associated with.
  MLIRContext *getContext() { return getIdentifier().getContext(); }
 
  /// Return the name of this operation. This always succeeds.
  StringRef getStringRef() const { return getIdentifier(); }
 
  /// Return the name of this operation as a StringAttr.
  StringAttr getIdentifier() const { return getImpl()->getName(); }
 
  void print(raw_ostream &os) const;
  void dump() const;
 
  /// Represent the operation name as an opaque pointer. (Used to support
  /// PointerLikeTypeTraits).
  void *getAsOpaquePointer() const { return const_cast<Impl *>(impl); }
  static OperationName getFromOpaquePointer(const void *pointer) {
    return OperationName(
        const_cast<Impl *>(reinterpret_cast<const Impl *>(pointer)));
  }
 
  bool operator==(const OperationName &rhs) const { return impl == rhs.impl; }
  bool operator!=(const OperationName &rhs) const { return !(*this == rhs); }
 
protected:
  OperationName(Impl *impl) : impl(impl) {}
  Impl *getImpl() const { return impl; }
  void setImpl(Impl *rhs) { impl = rhs; }
 
private:
  /// The internal implementation of the operation name.
  Impl *impl = nullptr;
 
  /// Allow access to the Impl struct.
  friend MLIRContextImpl;
  friend DenseMapInfo<mlir::OperationName>;
  friend DenseMapInfo<mlir::RegisteredOperationName>;
};
 
inline raw_ostream &operator<<(raw_ostream &os, OperationName info) {
  info.print(os);
  return os;
}
 
// Make operation names hashable.
inline llvm::hash_code hash_value(OperationName arg) {
  return llvm::hash_value(arg.getAsOpaquePointer());
}
 
//===----------------------------------------------------------------------===//
// RegisteredOperationName
//===----------------------------------------------------------------------===//
 
/// This is a "type erased" representation of a registered operation. This
/// should only be used by things like the AsmPrinter and other things that need
/// to be parameterized by generic operation hooks. Most user code should use
/// the concrete operation types.
class RegisteredOperationName : public OperationName {
public:
  /// Implementation of the InterfaceConcept for operation APIs that forwarded
  /// to a concrete op implementation.
  template <typename ConcreteOp>
  struct Model : public Impl {
    Model(Dialect *dialect)
        : Impl(ConcreteOp::getOperationName(), dialect,
               TypeID::get<ConcreteOp>(), ConcreteOp::getInterfaceMap()) {}
    LogicalResult foldHook(Operation *op, ArrayRef<Attribute> attrs,
                           SmallVectorImpl<OpFoldResult> &results) final {
      return ConcreteOp::getFoldHookFn()(op, attrs, results);
    }
    void getCanonicalizationPatterns(RewritePatternSet &set,
                                     MLIRContext *context) final {
      ConcreteOp::getCanonicalizationPatterns(set, context);
    }
    bool hasTrait(TypeID id) final { return ConcreteOp::getHasTraitFn()(id); }
    OperationName::ParseAssemblyFn getParseAssemblyFn() final {
      return ConcreteOp::parse;
    }
    void populateDefaultAttrs(const OperationName &name,
                              NamedAttrList &attrs) final {
      ConcreteOp::populateDefaultAttrs(name, attrs);
    }
    void printAssembly(Operation *op, OpAsmPrinter &printer,
                       StringRef name) final {
      ConcreteOp::getPrintAssemblyFn()(op, printer, name);
    }
    LogicalResult verifyInvariants(Operation *op) final {
      return ConcreteOp::getVerifyInvariantsFn()(op);
    }
    LogicalResult verifyRegionInvariants(Operation *op) final {
      return ConcreteOp::getVerifyRegionInvariantsFn()(op);
    }
 
    /// Implementation for "Properties"
 
    using Properties = std::remove_reference_t<
        decltype(std::declval<ConcreteOp>().getProperties())>;
 
    std::optional<Attribute> getInherentAttr(Operation *op,
                                             StringRef name) final {
      if constexpr (hasProperties) {
        auto concreteOp = cast<ConcreteOp>(op);
        return ConcreteOp::getInherentAttr(concreteOp->getContext(),
                                           concreteOp.getProperties(), name);
      }
      // If the op does not have support for properties, we dispatch back to the
      // dictionnary of discardable attributes for now.
      return cast<ConcreteOp>(op)->getDiscardableAttr(name);
    }
    void setInherentAttr(Operation *op, StringAttr name,
                         Attribute value) final {
      if constexpr (hasProperties) {
        auto concreteOp = cast<ConcreteOp>(op);
        return ConcreteOp::setInherentAttr(concreteOp.getProperties(), name,
                                           value);
      }
      // If the op does not have support for properties, we dispatch back to the
      // dictionnary of discardable attributes for now.
      return cast<ConcreteOp>(op)->setDiscardableAttr(name, value);
    }
    void populateInherentAttrs(Operation *op, NamedAttrList &attrs) final {
      if constexpr (hasProperties) {
        auto concreteOp = cast<ConcreteOp>(op);
        ConcreteOp::populateInherentAttrs(concreteOp->getContext(),
                                          concreteOp.getProperties(), attrs);
      }
    }
    LogicalResult
    verifyInherentAttrs(OperationName opName, NamedAttrList &attributes,
                        function_ref<InFlightDiagnostic()> emitError) final {
      if constexpr (hasProperties)
        return ConcreteOp::verifyInherentAttrs(opName, attributes, emitError);
      return success();
    }
    // Detect if the concrete operation defined properties.
    static constexpr bool hasProperties = !std::is_same_v<
        typename ConcreteOp::template InferredProperties<ConcreteOp>,
        EmptyProperties>;
 
    int getOpPropertyByteSize() final {
      if constexpr (hasProperties)
        return sizeof(Properties);
      return 0;
    }
    void initProperties(OperationName opName, OpaqueProperties storage,
                        OpaqueProperties init) final {
      using Properties =
          typename ConcreteOp::template InferredProperties<ConcreteOp>;
      if (init)
        new (storage.as<Properties *>()) Properties(*init.as<Properties *>());
      else
        new (storage.as<Properties *>()) Properties();
      if constexpr (hasProperties)
        ConcreteOp::populateDefaultProperties(opName,
                                              *storage.as<Properties *>());
    }
    void deleteProperties(OpaqueProperties prop) final {
      prop.as<Properties *>()->~Properties();
    }
    void populateDefaultProperties(OperationName opName,
                                   OpaqueProperties properties) final {
      if constexpr (hasProperties)
        ConcreteOp::populateDefaultProperties(opName,
                                              *properties.as<Properties *>());
    }
 
    LogicalResult
    setPropertiesFromAttr(OperationName opName, OpaqueProperties properties,
                          Attribute attr,
                          function_ref<InFlightDiagnostic()> emitError) final {
      if constexpr (hasProperties) {
        auto p = properties.as<Properties *>();
        return ConcreteOp::setPropertiesFromAttr(*p, attr, emitError);
      }
      emitError() << "this operation does not support properties";
      return failure();
    }
    Attribute getPropertiesAsAttr(Operation *op) final {
      if constexpr (hasProperties) {
        auto concreteOp = cast<ConcreteOp>(op);
        return ConcreteOp::getPropertiesAsAttr(concreteOp->getContext(),
                                               concreteOp.getProperties());
      }
      return {};
    }
    bool compareProperties(OpaqueProperties lhs, OpaqueProperties rhs) final {
      if constexpr (hasProperties) {
        return *lhs.as<Properties *>() == *rhs.as<Properties *>();
      } else {
        return true;
      }
    }
    void copyProperties(OpaqueProperties lhs, OpaqueProperties rhs) final {
      *lhs.as<Properties *>() = *rhs.as<Properties *>();
    }
    llvm::hash_code hashProperties(OpaqueProperties prop) final {
      if constexpr (hasProperties)
        return ConcreteOp::computePropertiesHash(*prop.as<Properties *>());
 
      return {};
    }
  };
 
  /// Lookup the registered operation information for the given operation.
  /// Returns std::nullopt if the operation isn't registered.
  static std::optional<RegisteredOperationName> lookup(StringRef name,
                                                       MLIRContext *ctx);
 
  /// Lookup the registered operation information for the given operation.
  /// Returns std::nullopt if the operation isn't registered.
  static std::optional<RegisteredOperationName> lookup(TypeID typeID,
                                                       MLIRContext *ctx);
 
  /// Register a new operation in a Dialect object.
  /// This constructor is used by Dialect objects when they register the list
  /// of operations they contain.
  template <typename T>
  static void insert(Dialect &dialect) {
    insert(std::make_unique<Model<T>>(&dialect), T::getAttributeNames());
  }
  /// The use of this method is in general discouraged in favor of
  /// 'insert<CustomOp>(dialect)'.
  static void insert(std::unique_ptr<OperationName::Impl> ownedImpl,
                     ArrayRef<StringRef> attrNames);
 
  /// Return the dialect this operation is registered to.
  Dialect &getDialect() const { return *getImpl()->getDialect(); }
 
  /// Use the specified object to parse this ops custom assembly format.
  ParseResult parseAssembly(OpAsmParser &parser, OperationState &result) const;
 
  /// Represent the operation name as an opaque pointer. (Used to support
  /// PointerLikeTypeTraits).
  static RegisteredOperationName getFromOpaquePointer(const void *pointer) {
    return RegisteredOperationName(
        const_cast<Impl *>(reinterpret_cast<const Impl *>(pointer)));
  }
 
private:
  RegisteredOperationName(Impl *impl) : OperationName(impl) {}
 
  /// Allow access to the constructor.
  friend OperationName;
};
 
inline std::optional<RegisteredOperationName>
OperationName::getRegisteredInfo() const {
  return isRegistered() ? RegisteredOperationName(impl)
                        : std::optional<RegisteredOperationName>();
}
 
//===----------------------------------------------------------------------===//
// Attribute Dictionary-Like Interface
//===----------------------------------------------------------------------===//
 
/// Attribute collections provide a dictionary-like interface. Define common
/// lookup functions.
namespace impl {
 
/// Unsorted string search or identifier lookups are linear scans.
template <typename IteratorT, typename NameT>
std::pair<IteratorT, bool> findAttrUnsorted(IteratorT first, IteratorT last,
                                            NameT name) {
  for (auto it = first; it != last; ++it)
    if (it->getName() == name)
      return {it, true};
  return {last, false};
}
 
/// Using llvm::lower_bound requires an extra string comparison to check whether
/// the returned iterator points to the found element or whether it indicates
/// the lower bound. Skip this redundant comparison by checking if `compare ==
/// 0` during the binary search.
template <typename IteratorT>
std::pair<IteratorT, bool> findAttrSorted(IteratorT first, IteratorT last,
                                          StringRef name) {
  ptrdiff_t length = std::distance(first, last);
 
  while (length > 0) {
    ptrdiff_t half = length / 2;
    IteratorT mid = first + half;
    int compare = mid->getName().strref().compare(name);
    if (compare < 0) {
      first = mid + 1;
      length = length - half - 1;
    } else if (compare > 0) {
      length = half;
    } else {
      return {mid, true};
    }
  }
  return {first, false};
}
 
/// StringAttr lookups on large attribute lists will switch to string binary
/// search. String binary searches become significantly faster than linear scans
/// with the identifier when the attribute list becomes very large.
template <typename IteratorT>
std::pair<IteratorT, bool> findAttrSorted(IteratorT first, IteratorT last,
                                          StringAttr name) {
  constexpr unsigned kSmallAttributeList = 16;
  if (std::distance(first, last) > kSmallAttributeList)
    return findAttrSorted(first, last, name.strref());
  return findAttrUnsorted(first, last, name);
}
 
/// Get an attribute from a sorted range of named attributes. Returns null if
/// the attribute was not found.
template <typename IteratorT, typename NameT>
Attribute getAttrFromSortedRange(IteratorT first, IteratorT last, NameT name) {
  std::pair<IteratorT, bool> result = findAttrSorted(first, last, name);
  return result.second ? result.first->getValue() : Attribute();
}
 
/// Get an attribute from a sorted range of named attributes. Returns
/// std::nullopt if the attribute was not found.
template <typename IteratorT, typename NameT>
std::optional<NamedAttribute>
getNamedAttrFromSortedRange(IteratorT first, IteratorT last, NameT name) {
  std::pair<IteratorT, bool> result = findAttrSorted(first, last, name);
  return result.second ? *result.first : std::optional<NamedAttribute>();
}
 
} // namespace impl
 
//===----------------------------------------------------------------------===//
// NamedAttrList
//===----------------------------------------------------------------------===//
 
/// NamedAttrList is array of NamedAttributes that tracks whether it is sorted
/// and does some basic work to remain sorted.
class NamedAttrList {
public:
  using iterator = SmallVectorImpl<NamedAttribute>::iterator;
  using const_iterator = SmallVectorImpl<NamedAttribute>::const_iterator;
  using reference = NamedAttribute &;
  using const_reference = const NamedAttribute &;
  using size_type = size_t;
 
  NamedAttrList() : dictionarySorted({}, true) {}
  NamedAttrList(std::nullopt_t none) : NamedAttrList() {}
  NamedAttrList(ArrayRef<NamedAttribute> attributes);
  NamedAttrList(DictionaryAttr attributes);
  NamedAttrList(const_iterator inStart, const_iterator inEnd);
 
  template <typename Container>
  NamedAttrList(const Container &vec)
      : NamedAttrList(ArrayRef<NamedAttribute>(vec)) {}
 
  bool operator!=(const NamedAttrList &other) const {
    return !(*this == other);
  }
  bool operator==(const NamedAttrList &other) const {
    return attrs == other.attrs;
  }
 
  /// Add an attribute with the specified name.
  void append(StringRef name, Attribute attr);
 
  /// Add an attribute with the specified name.
  void append(StringAttr name, Attribute attr) {
    append(NamedAttribute(name, attr));
  }
 
  /// Append the given named attribute.
  void append(NamedAttribute attr) { push_back(attr); }
 
  /// Add an array of named attributes.
  template <typename RangeT>
  void append(RangeT &&newAttributes) {
    append(std::begin(newAttributes), std::end(newAttributes));
  }
 
  /// Add a range of named attributes.
  template <typename IteratorT,
            typename = std::enable_if_t<std::is_convertible<
                typename std::iterator_traits<IteratorT>::iterator_category,
                std::input_iterator_tag>::value>>
  void append(IteratorT inStart, IteratorT inEnd) {
    // TODO: expand to handle case where values appended are in order & after
    // end of current list.
    dictionarySorted.setPointerAndInt(nullptr, false);
    attrs.append(inStart, inEnd);
  }
 
  /// Replaces the attributes with new list of attributes.
  void assign(const_iterator inStart, const_iterator inEnd);
 
  /// Replaces the attributes with new list of attributes.
  void assign(ArrayRef<NamedAttribute> range) {
    assign(range.begin(), range.end());
  }
 
  void clear() {
    attrs.clear();
    dictionarySorted.setPointerAndInt(nullptr, false);
  }
 
  bool empty() const { return attrs.empty(); }
 
  void reserve(size_type N) { attrs.reserve(N); }
 
  /// Add an attribute with the specified name.
  void push_back(NamedAttribute newAttribute);
 
  /// Pop last element from list.
  void pop_back() { attrs.pop_back(); }
 
  /// Returns an entry with a duplicate name the list, if it exists, else
  /// returns std::nullopt.
  std::optional<NamedAttribute> findDuplicate() const;
 
  /// Return a dictionary attribute for the underlying dictionary. This will
  /// return an empty dictionary attribute if empty rather than null.
  DictionaryAttr getDictionary(MLIRContext *context) const;
 
  /// Return all of the attributes on this operation.
  ArrayRef<NamedAttribute> getAttrs() const;
 
  /// Return the specified attribute if present, null otherwise.
  Attribute get(StringAttr name) const;
  Attribute get(StringRef name) const;
 
  /// Return the specified named attribute if present, std::nullopt otherwise.
  std::optional<NamedAttribute> getNamed(StringRef name) const;
  std::optional<NamedAttribute> getNamed(StringAttr name) const;
 
  /// If the an attribute exists with the specified name, change it to the new
  /// value. Otherwise, add a new attribute with the specified name/value.
  /// Returns the previous attribute value of `name`, or null if no
  /// attribute previously existed with `name`.
  Attribute set(StringAttr name, Attribute value);
  Attribute set(StringRef name, Attribute value);
 
  /// Erase the attribute with the given name from the list. Return the
  /// attribute that was erased, or nullptr if there was no attribute with such
  /// name.
  Attribute erase(StringAttr name);
  Attribute erase(StringRef name);
 
  iterator begin() { return attrs.begin(); }
  iterator end() { return attrs.end(); }
  const_iterator begin() const { return attrs.begin(); }
  const_iterator end() const { return attrs.end(); }
 
  NamedAttrList &operator=(const SmallVectorImpl<NamedAttribute> &rhs);
  operator ArrayRef<NamedAttribute>() const;
 
private:
  /// Return whether the attributes are sorted.
  bool isSorted() const { return dictionarySorted.getInt(); }
 
  /// Erase the attribute at the given iterator position.
  Attribute eraseImpl(SmallVectorImpl<NamedAttribute>::iterator it);
 
  /// Lookup an attribute in the list.
  template <typename AttrListT, typename NameT>
  static auto findAttr(AttrListT &attrs, NameT name) {
    return attrs.isSorted()
               ? impl::findAttrSorted(attrs.begin(), attrs.end(), name)
               : impl::findAttrUnsorted(attrs.begin(), attrs.end(), name);
  }
 
  // These are marked mutable as they may be modified (e.g., sorted)
  mutable SmallVector<NamedAttribute, 4> attrs;
  // Pair with cached DictionaryAttr and status of whether attrs is sorted.
  // Note: just because sorted does not mean a DictionaryAttr has been created
  // but the case where there is a DictionaryAttr but attrs isn't sorted should
  // not occur.
  mutable llvm::PointerIntPair<Attribute, 1, bool> dictionarySorted;
};
 
//===----------------------------------------------------------------------===//
// OperationState
//===----------------------------------------------------------------------===//
 
/// This represents an operation in an abstracted form, suitable for use with
/// the builder APIs.  This object is a large and heavy weight object meant to
/// be used as a temporary object on the stack.  It is generally unwise to put
/// this in a collection.
struct OperationState {
  Location location;
  OperationName name;
  SmallVector<Value, 4> operands;
  /// Types of the results of this operation.
  SmallVector<Type, 4> types;
  NamedAttrList attributes;
  /// Successors of this operation and their respective operands.
  SmallVector<Block *, 1> successors;
  /// Regions that the op will hold.
  SmallVector<std::unique_ptr<Region>, 1> regions;
 
  /// This Attribute is used to opaquely construct the properties of the
  /// operation. If we're creating an unregistered operation, the Attribute is
  /// used as-is as the Properties storage of the operation. Otherwise, the
  /// operation properties are constructed opaquely using its
  /// `setPropertiesFromAttr` hook. Note that `getOrAddProperties` is the
  /// preferred method to construct properties from C++.
  Attribute propertiesAttr;
 
private:
  OpaqueProperties properties = nullptr;
  TypeID propertiesId;
  llvm::function_ref<void(OpaqueProperties)> propertiesDeleter;
  llvm::function_ref<void(OpaqueProperties, const OpaqueProperties)>
      propertiesSetter;
  friend class Operation;
 
public:
  OperationState(Location location, StringRef name);
  OperationState(Location location, OperationName name);
 
  OperationState(Location location, OperationName name, ValueRange operands,
                 TypeRange types, ArrayRef<NamedAttribute> attributes = {},
                 BlockRange successors = {},
                 MutableArrayRef<std::unique_ptr<Region>> regions = {});
  OperationState(Location location, StringRef name, ValueRange operands,
                 TypeRange types, ArrayRef<NamedAttribute> attributes = {},
                 BlockRange successors = {},
                 MutableArrayRef<std::unique_ptr<Region>> regions = {});
  OperationState(OperationState &&other) = default;
  OperationState(const OperationState &other) = default;
  OperationState &operator=(OperationState &&other) = default;
  OperationState &operator=(const OperationState &other) = default;
  ~OperationState();
 
  /// Get (or create) a properties of the provided type to be set on the
  /// operation on creation.
  template <typename T>
  T &getOrAddProperties() {
    if (!properties) {
      T *p = new T{};
      properties = p;
      propertiesDeleter = [](OpaqueProperties prop) {
        delete prop.as<const T *>();
      };
      propertiesSetter = [](OpaqueProperties new_prop,
                            const OpaqueProperties prop) {
        *new_prop.as<T *>() = *prop.as<const T *>();
      };
      propertiesId = TypeID::get<T>();
    }
    assert(propertiesId == TypeID::get<T>() && "Inconsistent properties");
    return *properties.as<T *>();
  }
  OpaqueProperties getRawProperties() { return properties; }
 
  // Set the properties defined on this OpState on the given operation,
  // optionally emit diagnostics on error through the provided diagnostic.
  LogicalResult
  setProperties(Operation *op,
                function_ref<InFlightDiagnostic()> emitError) const;
 
  void addOperands(ValueRange newOperands);
 
  void addTypes(ArrayRef<Type> newTypes) {
    types.append(newTypes.begin(), newTypes.end());
  }
  template <typename RangeT>
  std::enable_if_t<!std::is_convertible<RangeT, ArrayRef<Type>>::value>
  addTypes(RangeT &&newTypes) {
    types.append(newTypes.begin(), newTypes.end());
  }
 
  /// Add an attribute with the specified name.
  void addAttribute(StringRef name, Attribute attr) {
    addAttribute(StringAttr::get(getContext(), name), attr);
  }
 
  /// Add an attribute with the specified name. `name` and `attr` must not be
  /// null.
  void addAttribute(StringAttr name, Attribute attr) {
    assert(name && "attribute name cannot be null");
    assert(attr && "attribute cannot be null");
    attributes.append(name, attr);
  }
 
  /// Add an array of named attributes.
  void addAttributes(ArrayRef<NamedAttribute> newAttributes) {
    attributes.append(newAttributes);
  }
 
  /// Adds a successor to the operation sate. `successor` must not be null.
  void addSuccessors(Block *successor) {
    assert(successor && "successor cannot be null");
    successors.push_back(successor);
  }
  void addSuccessors(BlockRange newSuccessors);
 
  /// Create a region that should be attached to the operation.  These regions
  /// can be filled in immediately without waiting for Operation to be
  /// created.  When it is, the region bodies will be transferred.
  Region *addRegion();
 
  /// Take a region that should be attached to the Operation.  The body of the
  /// region will be transferred when the Operation is constructed.  If the
  /// region is null, a new empty region will be attached to the Operation.
  void addRegion(std::unique_ptr<Region> &&region);
 
  /// Take ownership of a set of regions that should be attached to the
  /// Operation.
  void addRegions(MutableArrayRef<std::unique_ptr<Region>> regions);
 
  /// Get the context held by this operation state.
  MLIRContext *getContext() const { return location->getContext(); }
};
 
//===----------------------------------------------------------------------===//
// OperandStorage
//===----------------------------------------------------------------------===//
 
namespace detail {
/// This class handles the management of operation operands. Operands are
/// stored either in a trailing array, or a dynamically resizable vector.
class alignas(8) OperandStorage {
public:
  OperandStorage(Operation *owner, OpOperand *trailingOperands,
                 ValueRange values);
  ~OperandStorage();
 
  /// Replace the operands contained in the storage with the ones provided in
  /// 'values'.
  void setOperands(Operation *owner, ValueRange values);
 
  /// Replace the operands beginning at 'start' and ending at 'start' + 'length'
  /// with the ones provided in 'operands'. 'operands' may be smaller or larger
  /// than the range pointed to by 'start'+'length'.
  void setOperands(Operation *owner, unsigned start, unsigned length,
                   ValueRange operands);
 
  /// Erase the operands held by the storage within the given range.
  void eraseOperands(unsigned start, unsigned length);
 
  /// Erase the operands held by the storage that have their corresponding bit
  /// set in `eraseIndices`.
  void eraseOperands(const BitVector &eraseIndices);
 
  /// Get the operation operands held by the storage.
  MutableArrayRef<OpOperand> getOperands() { return {operandStorage, size()}; }
 
  /// Return the number of operands held in the storage.
  unsigned size() { return numOperands; }
 
private:
  /// Resize the storage to the given size. Returns the array containing the new
  /// operands.
  MutableArrayRef<OpOperand> resize(Operation *owner, unsigned newSize);
 
  /// The total capacity number of operands that the storage can hold.
  unsigned capacity : 31;
  /// A flag indicating if the operand storage was dynamically allocated, as
  /// opposed to inlined into the owning operation.
  unsigned isStorageDynamic : 1;
  /// The number of operands within the storage.
  unsigned numOperands;
  /// A pointer to the operand storage.
  OpOperand *operandStorage;
};
} // namespace detail
 
//===----------------------------------------------------------------------===//
// OpPrintingFlags
//===----------------------------------------------------------------------===//
 
/// Set of flags used to control the behavior of the various IR print methods
/// (e.g. Operation::Print).
class OpPrintingFlags {
public:
  OpPrintingFlags();
  OpPrintingFlags(std::nullopt_t) : OpPrintingFlags() {}
 
  /// Enables the elision of large elements attributes by printing a lexically
  /// valid but otherwise meaningless form instead of the element data. The
  /// `largeElementLimit` is used to configure what is considered to be a
  /// "large" ElementsAttr by providing an upper limit to the number of
  /// elements.
  OpPrintingFlags &elideLargeElementsAttrs(int64_t largeElementLimit = 16);
 
  /// Enables the printing of large element attributes with a hex string. The
  /// `largeElementLimit` is used to configure what is considered to be a
  /// "large" ElementsAttr by providing an upper limit to the number of
  /// elements. Use -1 to disable the hex printing.
  OpPrintingFlags &
  printLargeElementsAttrWithHex(int64_t largeElementLimit = 100);
 
  /// Enables the elision of large resources strings by omitting them from the
  /// `dialect_resources` section. The `largeResourceLimit` is used to configure
  /// what is considered to be a "large" resource by providing an upper limit to
  /// the string size.
  OpPrintingFlags &elideLargeResourceString(int64_t largeResourceLimit = 64);
 
  /// Enable or disable printing of debug information (based on `enable`). If
  /// 'prettyForm' is set to true, debug information is printed in a more
  /// readable 'pretty' form. Note: The IR generated with 'prettyForm' is not
  /// parsable.
  OpPrintingFlags &enableDebugInfo(bool enable = true, bool prettyForm = false);
 
  /// Always print operations in the generic form.
  OpPrintingFlags &printGenericOpForm(bool enable = true);
 
  /// Skip printing regions.
  OpPrintingFlags &skipRegions(bool skip = true);
 
  /// Do not verify the operation when using custom operation printers.
  OpPrintingFlags &assumeVerified();
 
  /// Use local scope when printing the operation. This allows for using the
  /// printer in a more localized and thread-safe setting, but may not
  /// necessarily be identical to what the IR will look like when dumping
  /// the full module.
  OpPrintingFlags &useLocalScope();
 
  /// Print users of values as comments.
  OpPrintingFlags &printValueUsers();
 
  /// Return if the given ElementsAttr should be elided.
  bool shouldElideElementsAttr(ElementsAttr attr) const;
 
  /// Return if the given ElementsAttr should be printed as hex string.
  bool shouldPrintElementsAttrWithHex(ElementsAttr attr) const;
 
  /// Return the size limit for printing large ElementsAttr.
  std::optional<int64_t> getLargeElementsAttrLimit() const;
 
  /// Return the size limit for printing large ElementsAttr as hex string.
  int64_t getLargeElementsAttrHexLimit() const;
 
  /// Return the size limit in chars for printing large resources.
  std::optional<uint64_t> getLargeResourceStringLimit() const;
 
  /// Return if debug information should be printed.
  bool shouldPrintDebugInfo() const;
 
  /// Return if debug information should be printed in the pretty form.
  bool shouldPrintDebugInfoPrettyForm() const;
 
  /// Return if operations should be printed in the generic form.
  bool shouldPrintGenericOpForm() const;
 
  /// Return if regions should be skipped.
  bool shouldSkipRegions() const;
 
  /// Return if operation verification should be skipped.
  bool shouldAssumeVerified() const;
 
  /// Return if the printer should use local scope when dumping the IR.
  bool shouldUseLocalScope() const;
 
  /// Return if the printer should print users of values.
  bool shouldPrintValueUsers() const;
 
  /// Return if printer should use unique SSA IDs.
  bool shouldPrintUniqueSSAIDs() const;
 
private:
  /// Elide large elements attributes if the number of elements is larger than
  /// the upper limit.
  std::optional<int64_t> elementsAttrElementLimit;
 
  /// Elide printing large resources based on size of string.
  std::optional<uint64_t> resourceStringCharLimit;
 
  /// Print large element attributes with hex strings if the number of elements
  /// is larger than the upper limit.
  int64_t elementsAttrHexElementLimit = 100;
 
  /// Print debug information.
  bool printDebugInfoFlag : 1;
  bool printDebugInfoPrettyFormFlag : 1;
 
  /// Print operations in the generic form.
  bool printGenericOpFormFlag : 1;
 
  /// Always skip Regions.
  bool skipRegionsFlag : 1;
 
  /// Skip operation verification.
  bool assumeVerifiedFlag : 1;
 
  /// Print operations with numberings local to the current operation.
  bool printLocalScope : 1;
 
  /// Print users of values.
  bool printValueUsersFlag : 1;
 
  /// Print unique SSA IDs for values, block arguments and naming conflicts
  bool printUniqueSSAIDsFlag : 1;
};
 
//===----------------------------------------------------------------------===//
// Operation Equivalency
//===----------------------------------------------------------------------===//
 
/// This class provides utilities for computing if two operations are
/// equivalent.
struct OperationEquivalence {
  enum Flags {
    None = 0,
 
    // When provided, the location attached to the operation are ignored.
    IgnoreLocations = 1,
 
    LLVM_MARK_AS_BITMASK_ENUM(/* LargestValue = */ IgnoreLocations)
  };
 
  /// Compute a hash for the given operation.
  /// The `hashOperands` and `hashResults` callbacks are expected to return a
  /// unique hash_code for a given Value.
  static llvm::hash_code computeHash(
      Operation *op,
      function_ref<llvm::hash_code(Value)> hashOperands =
          [](Value v) { return hash_value(v); },
      function_ref<llvm::hash_code(Value)> hashResults =
          [](Value v) { return hash_value(v); },
      Flags flags = Flags::None);
 
  /// Helper that can be used with `computeHash` above to ignore operation
  /// operands/result mapping.
  static llvm::hash_code ignoreHashValue(Value) { return llvm::hash_code{}; }
  /// Helper that can be used with `computeHash` above to ignore operation
  /// operands/result mapping.
  static llvm::hash_code directHashValue(Value v) { return hash_value(v); }
 
  /// Compare two operations (including their regions) and return if they are
  /// equivalent.
  ///
  /// * `checkEquivalent` is a callback to check if two values are equivalent.
  ///   For two operations to be equivalent, their operands must be the same SSA
  ///   value or this callback must return `success`.
  /// * `markEquivalent` is a callback to inform the caller that the analysis
  ///   determined that two values are equivalent.
  /// * `checkCommutativeEquivalent` is an optional callback to check for
  ///   equivalence across two ranges for a commutative operation. If not passed
  ///   in, then equivalence is checked pairwise. This callback is needed to be
  ///   able to query the optional equivalence classes.
  ///
  /// Note: Additional information regarding value equivalence can be injected
  /// into the analysis via `checkEquivalent`. Typically, callers may want
  /// values that were determined to be equivalent as per `markEquivalent` to be
  /// reflected in `checkEquivalent`, unless `exactValueMatch` or a different
  /// equivalence relationship is desired.
  static bool
  isEquivalentTo(Operation *lhs, Operation *rhs,
                 function_ref<LogicalResult(Value, Value)> checkEquivalent,
                 function_ref<void(Value, Value)> markEquivalent = nullptr,
                 Flags flags = Flags::None,
                 function_ref<LogicalResult(ValueRange, ValueRange)>
                     checkCommutativeEquivalent = nullptr);
 
  /// Compare two operations and return if they are equivalent.
  static bool isEquivalentTo(Operation *lhs, Operation *rhs, Flags flags);
 
  /// Compare two regions (including their subregions) and return if they are
  /// equivalent. See also `isEquivalentTo` for details.
  static bool isRegionEquivalentTo(
      Region *lhs, Region *rhs,
      function_ref<LogicalResult(Value, Value)> checkEquivalent,
      function_ref<void(Value, Value)> markEquivalent,
      OperationEquivalence::Flags flags,
      function_ref<LogicalResult(ValueRange, ValueRange)>
          checkCommutativeEquivalent = nullptr);
 
  /// Compare two regions and return if they are equivalent.
  static bool isRegionEquivalentTo(Region *lhs, Region *rhs,
                                   OperationEquivalence::Flags flags);
 
  /// Helper that can be used with `isEquivalentTo` above to consider ops
  /// equivalent even if their operands are not equivalent.
  static LogicalResult ignoreValueEquivalence(Value lhs, Value rhs) {
    return success();
  }
  /// Helper that can be used with `isEquivalentTo` above to consider ops
  /// equivalent only if their operands are the exact same SSA values.
  static LogicalResult exactValueMatch(Value lhs, Value rhs) {
    return success(lhs == rhs);
  }
};
 
/// Enable Bitmask enums for OperationEquivalence::Flags.
LLVM_ENABLE_BITMASK_ENUMS_IN_NAMESPACE();
 
//===----------------------------------------------------------------------===//
// OperationFingerPrint
//===----------------------------------------------------------------------===//
 
/// A unique fingerprint for a specific operation, and all of it's internal
/// operations (if `includeNested` is set).
class OperationFingerPrint {
public:
  OperationFingerPrint(Operation *topOp, bool includeNested = true);
  OperationFingerPrint(const OperationFingerPrint &) = default;
  OperationFingerPrint &operator=(const OperationFingerPrint &) = default;
 
  bool operator==(const OperationFingerPrint &other) const {
    return hash == other.hash;
  }
  bool operator!=(const OperationFingerPrint &other) const {
    return !(*this == other);
  }
 
private:
  std::array<uint8_t, 20> hash;
};
 
} // namespace mlir
 
namespace llvm {
template <>
struct DenseMapInfo<mlir::OperationName> {
  static mlir::OperationName getEmptyKey() {
    void *pointer = llvm::DenseMapInfo<void *>::getEmptyKey();
    return mlir::OperationName::getFromOpaquePointer(pointer);
  }
  static mlir::OperationName getTombstoneKey() {
    void *pointer = llvm::DenseMapInfo<void *>::getTombstoneKey();
    return mlir::OperationName::getFromOpaquePointer(pointer);
  }
  static unsigned getHashValue(mlir::OperationName val) {
    return DenseMapInfo<void *>::getHashValue(val.getAsOpaquePointer());
  }
  static bool isEqual(mlir::OperationName lhs, mlir::OperationName rhs) {
    return lhs == rhs;
  }
};
template <>
struct DenseMapInfo<mlir::RegisteredOperationName>
    : public DenseMapInfo<mlir::OperationName> {
  static mlir::RegisteredOperationName getEmptyKey() {
    void *pointer = llvm::DenseMapInfo<void *>::getEmptyKey();
    return mlir::RegisteredOperationName::getFromOpaquePointer(pointer);
  }
  static mlir::RegisteredOperationName getTombstoneKey() {
    void *pointer = llvm::DenseMapInfo<void *>::getTombstoneKey();
    return mlir::RegisteredOperationName::getFromOpaquePointer(pointer);
  }
};
 
template <>
struct PointerLikeTypeTraits<mlir::OperationName> {
  static inline void *getAsVoidPointer(mlir::OperationName I) {
    return const_cast<void *>(I.getAsOpaquePointer());
  }
  static inline mlir::OperationName getFromVoidPointer(void *P) {
    return mlir::OperationName::getFromOpaquePointer(P);
  }
  static constexpr int NumLowBitsAvailable =
      PointerLikeTypeTraits<void *>::NumLowBitsAvailable;
};
template <>
struct PointerLikeTypeTraits<mlir::RegisteredOperationName>
    : public PointerLikeTypeTraits<mlir::OperationName> {
  static inline mlir::RegisteredOperationName getFromVoidPointer(void *P) {
    return mlir::RegisteredOperationName::getFromOpaquePointer(P);
  }
};
 
} // namespace llvm
 
#endif